tests/pkg_semtech-loramac: add note about duty-cycle disabling
tests/pkg_semtech-loramac: add note about duty-cycle disabling

authmillenon/RIOT,x3ro/RIOT,rfuentess/RIOT,OlegHahm/RIOT,aeneby/RIOT,smlng/RIOT,basilfx/RIOT,RIOT-OS/RIOT,mtausig/RIOT,OTAkeys/RIOT,RIOT-OS/RIOT,yogo1212/RIOT,lazytech-org/RIOT,mfrey/RIOT,OlegHahm/RIOT,toonst/RIOT,smlng/RIOT,mfrey/RIOT,rfuentess/RIOT,x3ro/RIOT,yogo1212/RIOT,cladmi/RIOT,mtausig/RIOT,toonst/RIOT,kaspar030/RIOT,ant9000/RIOT,kYc0o/RIOT,RIOT-OS/RIOT,kaspar030/RIOT,jasonatran/RIOT,yogo1212/RIOT,smlng/RIOT,RIOT-OS/RIOT,OTAkeys/RIOT,ant9000/RIOT,aeneby/RIOT,lazytech-org/RIOT,OTAkeys/RIOT,lazytech-org/RIOT,aeneby/RIOT,smlng/RIOT,RIOT-OS/RIOT,x3ro/RIOT,jasonatran/RIOT,josephnoir/RIOT,x3ro/RIOT,yogo1212/RIOT,authmillenon/RIOT,lazytech-org/RIOT,miri64/RIOT,ant9000/RIOT,aeneby/RIOT,OlegHahm/RIOT,authmillenon/RIOT,cladmi/RIOT,miri64/RIOT,cladmi/RIOT,josephnoir/RIOT,mtausig/RIOT,OTAkeys/RIOT,kaspar030/RIOT,authmillenon/RIOT,toonst/RIOT,mtausig/RIOT,rfuentess/RIOT,josephnoir/RIOT,cladmi/RIOT,cladmi/RIOT,authmillenon/RIOT,aeneby/RIOT,kYc0o/RIOT,josephnoir/RIOT,ant9000/RIOT,mfrey/RIOT,toonst/RIOT,kYc0o/RIOT,ant9000/RIOT,kaspar030/RIOT,basilfx/RIOT,miri64/RIOT,josephnoir/RIOT,lazytech-org/RIOT,kYc0o/RIOT,toonst/RIOT,authmillenon/RIOT,mfrey/RIOT,rfuentess/RIOT,kYc0o/RIOT,miri64/RIOT,mfrey/RIOT,x3ro/RIOT,rfuentess/RIOT,basilfx/RIOT,basilfx/RIOT,smlng/RIOT,yogo1212/RIOT,jasonatran/RIOT,jasonatran/RIOT,jasonatran/RIOT,OlegHahm/RIOT,OlegHahm/RIOT,miri64/RIOT,OTAkeys/RIOT,yogo1212/RIOT,basilfx/RIOT,kaspar030/RIOT,mtausig/RIOT